NEXT_PUBLIC environment variables not working in productoin

Answered

Masai Lion posted this in #help-forum

Masai LionOP

2024-08-31T22:30:47.930Z

I am trying to set an environment variable using NEXT_PUBLIC_VAR=value and it works when dev mode is on but when I build and start next the environment variable stays undefined. I'm using process.env.NEXT_PUBLIC_VAR to get the variable

Answered by Masai Lion

You have to set them with dockerfile

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16 Replies

@Masai Lion I am trying to set an environment variable using NEXT_PUBLIC_VAR=value and it works when dev mode is on but when I build and start next the environment variable stays undefined. I'm using `process.env.NEXT_PUBLIC_VAR` to get the variable

Turkish Angora

2024-09-01T21:17:52.580Z

did you solve it ?

@Turkish Angora did you solve it ?

Masai LionOP

2024-09-01T22:36:23.514Z

I figured out the problem was that next doesn't load env vars on build time from .env

Masai LionOP

2024-09-01T22:36:28.594Z

You have to set them with dockerfile

Answer

@Masai Lion You have to set them with dockerfile

Cimarrón Uruguayo

2024-09-02T01:30:57.535Z

or you can copy the env file in your dockerfile

@Cimarrón Uruguayo or you can copy the env file in your dockerfile

Masai LionOP

2024-09-02T01:53:33.453Z

I'm doing that with docker compose

@Masai Lion I'm doing that with docker compose

Cimarrón Uruguayo

2024-09-02T01:53:56.137Z

sure that also works

Masai LionOP

2024-09-02T01:53:57.075Z

But I guess that docker compose loads env during runtime

So it doesn't work

Cimarrón Uruguayo

2024-09-02T01:54:05.469Z

yeah to be safe

just copy the .env file

into ur container environment

so that nextjs will automatically pickup the file

when you run the build command

Masai LionOP

2024-09-02T01:54:47.120Z

Yeah